printf的问题

[xiazdong]

public class Printf01
{
	public static void main(String[] args) {
		System.out.printf("%f,%b",Math.PI,Math.E);	//输出：3.141593,true
	}
}

请问：第二个参数是 %b，应该接受boolean值，为什么接受了 Math.E 能够编译，并且输出 true。

请大神帮忙！

[huntor]

If the argument arg is null, then the result is "false". If arg is a boolean or Boolean, then the result is the string returned by String.valueOf(arg). Otherwise, the result is "true". source : Formatter javadoc

[杨春华]

[valenon]

引用 1 楼 huntor 的回复:

If the argument arg is null, then the result is "false". If arg is a boolean or Boolean, then the result is the string returned by String.valueOf(arg). Otherwise, the result is "true". source : Formatter javadoc

[Mourinho]